Note 1 - Stock Option Activity (Details) - 6 months ended Jun. 30, 2015 - $ / shares	Total
Outstanding December 31, 2014 (in shares)	1,003,826
Outstanding December 31, 2014 (in dollars per share)	$ 7.71
Granted (in shares)	103,308
Granted (in dollars per share)	$ 18.46
Exercised (in shares)	(212,540)
Exercised (in dollars per share)	$ 7.27
Lapsed (in shares)	(5,000)
Lapsed (in dollars per share)	$ 5.78